Milk heater



May 25,1937. C, HHAPGOQD 2,081,432

MILK HEATER Filed Aug. e, 195e 2 shee1-,s-.sheec 1 gl k m L) "3 c:

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MILK HEATER Filed Aug. 6, 1936 2 Sheets-Shea?l 2 V m\\\:///, L,

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Patented May 25, 1937'L f' TES `ATE'',i FFIQE I MILK HEATERCyrllsglioward Hangend, Nutley, vN. J., assigner to ThelDe LavalCompany, Limited, Peter-` 1 "borough, Ontario, Canada, a. corporation of."@fCanada appiieaeennuglust e, 1936, serial No. 94,500

y y A :s .elaine (o1.v 257-64.)

My invention relates to that known type of tank, the nozzles h, h withthe double flared end liquid heater, especially intended for the heatingopenings d, d of the chamber c acting as injectors of milk,whichlcomprises a long and narrow tank to force water, admitted tochamber `c through `in which are arranged one ori'nore coils oftubes,its top opening e, lengthwise of the tank toward e the tubes of a coilextending lengthwise of the opposite'ends thereof, vas indicated by thearrows. 5

tank and being arranged one above another in The interior of the tank isequipped with a the same vertical plane and being connected at number ofguides or bafes i, which compel the the ends by headers that provideaclosed path water to circulate, in two streams on opposite for theflowtof the milk under pressure through sides of the central part of thetank, at successivethe coil or'coils. In such *heaters the milk is lyhigher levels in successively opposite directions 10 heated by fluidflowing..thrcugh the tank. longitudinally of the tubes, the water beingpre- Such heaters may be used to heat the milk vented, by the baiiles orp-artitions lc, from reachthrough `a comparatively .small temperatureing the central portion of the tank until after it range, say from 40 F.to le-85 F., preparatory rises above the upper pipe of the series, abovel5 to centrifuging, or to a substantially higher ternand along which itflows to thecenter rof the tank 15 perature, Say 145 F.,forlpasteurizing. and thence down between partitions lc to the Theobject of my .invention is to provide a chamber c into which it is drawnand from which heater .by means of which the milk may be heated it isagain forcibly discharged `by the injector by a fluid, preferably water,but little hotter than action of the steam from the nozzles h, h.

A the temperature to which it is Adesired to raise the The steamsupplied to the water, as above 20 milk and also so to circulate theheating fluid described, reheats the water. As the volume of as `toavoid local overheating but nevertheless at water increases due tocondensation of steam,v the same time raise :the temperature of the milkthe excess is discharged through the overflow as rapidly as possibleconsistenti` with the comp'ipe m. y y

`.25 paratively low temperature ofthe heating fluid. Applied tolone ofthe endfwalls b, b" of the tank 25 To this end I provide means to insurethe circu- (the left hand wall in Fig. 1) are a series of blocks lationof the heating liquid in a novel manner n, n, n, n, each block havingtwo holes aligning through the tank. i with holes in the tank wall andadapted to receive A preferred embodiment of the invention is the ends0f tWOadJ'aCent tubes, the tubes being shown in the drawings, inwhichxedly or permanently secured in the holes by 30 Fig. 1 is a sideelevation, mostly in section, of soldering, brazing or otherwise; oneblock being the complete heater. arranged to thus receive the ends oftubes l and Fig. 2 is a top view of the heater partly in 2, anotherblock the ends of tubes 3 and 4, and section. so on. Each of theseblocks is secured to the tank Fig. 3 is a detailsectional View showingthe wall. 35 tubes and their end connections. Pivotally secured to eachblock n is a-lever o The heating fluid, which will ordinarily be hotthrough which, between its ends, extends a pin p, water, isadapted tocirculate within a tank a, from which is suspended a cap s. Alsopivotally which is narrow relative to its length and height. secured toeach block n is a rod t which extends It need be of a width onlysufficient to accommoloosely through the end of lever o. Each cap s 40date a single series of tubes, I to 8, arranged one is adapted to beswung into and out of position to above another, through which and endheaders seat upon the corresponding block and is held in (hereinafterdescribed) the milk or other liquid place thereon by means of athumb-nut u on the to be heated is adapted to flow, the milk being rodt. The caps s constitute the headers which admitted, preferably, intopipe l and discharged afford communication between the corresponding 45from pipe 8, the inlet and outlet being at the ends of adjacent pipes Iand 2, 3 and 4, etc. same side of the tank. The other ends of the tubesl-8 project through In the bottomof the tank, midway between its holesin the other end wall b of the tank and end walls, is positioned achamber c having extend beyond such wall. The ends of tubes I doubleflared outlet openings d, d, extending toand 8 are adapted forconnection respectively to 50 ward opposite ends of the tank and aninlet openthe supply and discharge pipes (not shown) for ing e at itstop. Within the chamber c is a small the milk or other liquid to beheated. The ends tubular chamber having an opening g in its side oftubes 2 to 'l inclusive are connected in pairs, for connection with asteam pipe, and end noz- 2 and 3, 4 and 5, 6 and 1, to blocks v, '11, u.The

zles h, 71.,V directed toward opposite ends of the blocks Umay beidentical in structure with blocks 55 11., and the ends of the tubesengaging blocks o are xedly or permanently secured thereto in the sameway as the other ends of the tubes are secured to blocks n. Caps w,constituting headers affording communication between the ends of pairsof tubes 2 and 3, etc., are applied to blocks u and may be pivotallymounted thereon in the same way that the headers s are mounted on theblocks n. Flanges fr, bolted to the right hand end wall, and packingrings y, seal the openings through which the right hand ends of thetubes project. Similar ring packing .e seals the openings in the wall bthrough which the left hand ends of the tubes project into the blocks n.

Access to the tubes for cleaning may be obtained by removing thethumb-nuts u and swinging out the corresponding headers.

It will be understood that the number of tubes of a series may be variedas desired. More than one series of tubes may be substituted for asingle series. Such a modication would be substantially a duplication ofthe construction described and therefore need not be illustrated.

By means of the foregoing construction the circulation of the water issuch that the ilowing stream is brought into heat exchange relation withthe entire body of milk that may be at any time flowing through thetubes. By heating the water at about the center of the length of thetank and dividing it into two streams and causing these streams to ilowin respectively opposite directions through the two halves of the tankthe length of the flowing stream is reduced one half so that the time ofnow is not so prolonged as to cause the water to lose its excess heatbefore it has completed a circuit. In other words I provide for heatexchange between the water and all parts of the milk while stillproviding for an eiliciently short time interval between successiveapplications of heat to any part of the circulating water stream.

What I claim and desire to protect by Letters Patent is:

l. A milk heater comprising atank,narrowrela tive to its length andheight, adapted to contain a heating iluid, a series of horizontallydisposed tubes within the tank arranged one above another, end headersconnecting adjacent tubes to provide a continuous ow passage for liquidto be heated through the tubes successively, means in the bottom part ofthe tank to force the heating fluid to flow laterally in the directionof extension of the tubes, and baffles in the tank to compel the liquidto flow at successively higher levels in successively oppositedirections longitudinally of the tubes and thence downward.

2. A milk heater comprising a tank, narrow relative to its length andheight, adapted to contain a heating fluid, a series of horizontallyextending tubes arranged within the tank one above another, end headersconnecting adjacent tubes to provide, through the tubes successively, acontinuous flow passage for the liquid to be heated, means in the tankto force the heating uid to flow from about midway of the tank inopposite directions parallel to the tubes toward opposite ends of thetank in heat exchange relation with one or more tubes and thence to flowin opposite directions parallel to the tubes toward the central part ofthe tank in heat exchange relation with one or more other tubes andthence complete the circuit.

3. A milk heater comprising a tank, narrow relative to its length andheight, adapted to contain a heating uid, a series of horizontally ex-5' tending tubes arranged within the tank one above another, end headersconnecting adjacent tubes to provide, through the tubes successively, acontinuous flow passage for the liquid to be heated,

means in the bottom part of the tank about mid- 5

